GetSimple CMS CE Update Handler Remote Code Execution Vulnerability

GetSimple CMS CE is affected by a remote code execution vulnerability in its update handler. Prior to version 1.5, the update handler in UpdateCE.php downloads a ZIP archive and extracts its contents into the web root without validating file types or extraction paths.

Because PHP files are written into a web-accessible directory, an attacker who can cause a malicious archive to be processed achieves remote code execution as the web-server user. Entry names are also used unsafely, allowing directory traversal (../) to write files outside the intended extraction directory.

• Affected: GetSimple CMS CE before version 1.5
• Impact: Remote code execution as the web-server user; arbitrary file write via directory traversal
• Patched: version 1.5